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i have them on my 19s. they are fairly quiet and the treadwear is decent. grip wise they leave a lot to be desired vs. my old hankook ventus v12 k110 evos but then again the proxes are an all season....

the E34 definitely feels lighter. but i can enter, drive through, and exit turns at much higher speeds and with more stability in my E39. also the chassis feels a lot stiffer. i have a sport package...